The influence of nanosilica on wear resistance of ceramic-polymer composites intended for dental fillings
|Joanna Siejka-Kulczyk 1, Joanna Mystkowska , Malgorzata Lewandowska 1, Eugeniusz Sajewicz , Jan R. Dąbrowski 2|
1. Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland
Good wear resistance is one of the major requirements for ceramic – polymer composites intended for dental fillings. It is strongly affected by the size and amount of fillers. The main goal of this study was to evaluate the influence of nanofiller (nanosilica) addition on tribological properties of such composites.
Ceramic – polymer composites based on acrylic resins (bis – GMA + TEGDMA) and urethane – methacrylate resin (UM) with 60 % total volume fraction of filler were fabricated. Nanosilica contents were: 0, 10, 20 vol. %. Next, the materials were subjected to wear tests using occlusion simulator tester. The apparatus provides reciprocating movement and cyclic loading of the testing sample. In this way, some similarity to the masticatory pattern occurring in the mouth has been reached. Human enamel was used as a countersample. Wear resistance of both composites and enamel was estimated. Friction coefficient was also measured.
The results of the study indicate that nanosilica addition significantly improves the wear resistance of ceramic – polymer composites and reduces the wear of enamel. It was found that nanosilica addition does not influence on friction coefficient value. It was also revealed that the kind of resin does not significantly influence the wear behaviour of the composites.
Presentation: Poster at E-MRS Fall Meeting 2008, Symposium F, by Malgorzata Lewandowska
See On-line Journal of E-MRS Fall Meeting 2008
Submitted: 2008-05-16 15:07 Revised: 2009-06-07 00:48